Some of the people tweeting about traingate raised the possibility of Virgin Trains facing action for breaching the DPA but on tweeter said the ICO’s resources were limited and the potential DPA breach was not “severe”.

Corbyn’s likeness is clear in the CCTV, though the faces of other passengers have been pixellated.

The ICO has the power to fine organisations that breach the data protection laws.

Last week, it fined Hampshire County Council £100,000 for leaving the personal details of 100 people were found in a disused building.

Barrister Matthew Scott tweeted a section of the Virgin’s privacy policy, which said it would not “share or distribute any of the information you provide to us to unaffiliated third parties without receiving your consent, unless required to so by law”.

Scott said this included the CCTV on the trains.

Here is an extract from Virgin's June 2016 privacy policy (it includes information from CCTV on trains). pic.twitter.com/RyLcyDxqPc

The Information Commissioner’s Office, which regulates the DPA, said it was “aware of the issue” when contacted with complaints about Virgin’s CCTV release, and confirmed to The Huffington Post UK it was “making enquiries”.

“We are aware of the publication of CCTV images of Jeremy Corbyn and are making enquiries,” an ICO spokesperson said.

“All organisations have an obligation to comply with the Data Protection Act and must have legitimate grounds for processing the personal data they hold.

“Where there’s a suggestion that this hasn’t happened, the ICO has the power to investigate and can take enforcement action if necessary.”